半干旱区涌流畦灌模型应用研究

涌流灌溉作为一种先进的节水灌溉方式，非常适用于水资源匮乏，经济基础薄弱的干旱和半干旱地区。通过对辽宁西部半干旱褐土区的涌流畦灌进行的试验研究，在应用ＹＳＭ畦灌分析模型的基础上，建立了简便易解的涌流畦灌模型并通过模型仿真对灌水质量进行评价，得到藻水技术要素的优化组合。

A STUDY ON APPLICATION OF SURGE FLOW BORDER IRRIGATION MODEL IN SEMIARID REGION

Surge Flow Irrigation, originated in USA, is a kind of advanced water saving irrigation. For its lower costing, it suits for arid and semi arid regions with undeveloped economy. In order to provide the optimum parameters and their combinations for Surge Flow Irrigation program, Saint-Venant equation (the full hydrodynamic Model) was often applied to describe water flow on open channel and develop models. This equation is, however, very complicit to be solved. In this paper, a new simple and accurate model for Surge Flow Border Irrigation is presented, based on the analytical border irrigation model originally developed by Yu and Singh (1989). (1) The new model is a semi theory and semi experience model, in which water advance phase is imitated by the implicit function and solved by iteration, and water recession phase is described by the experience equation. (2) A comparison of the values calculated by the proposed method with observed values shows that the average relative errors for water advance phase and recession phase were only 8.2% and 4.6%, respectively. Reasonable prediction results, therefore, can be obtained by using the proposed method. (3) Field experiments were conducted in semi arid cinnamon soil region, western Liaoning province. On the basis of property of cinnamon soil intermittent infiltration and flow in fields, by using the proposed model, the irrigation quality was predicted and the optimum parameter combination determined to guide farmers in local region for water saving irrigation management.